Infidelity Support Group
Any relationship in which one partner engages willfully in sexual relations with another outside of the partnership is considered to have experienced infidelity. This breach of trust is often traumatizing for the faithful partner as well as the relationship, and support is often needed to heal emotionally and to decide whether or not the relationship should continue after...

You have to know what you can live with.
He needs to tell you everything, so you can heal.
doesn't mean you stay or go, but means you need to heal.
If you truly don't have family or friends close enough, talk to them daily or hourly, where them all out on the phone, you need support.
Write it all down it will help in the long run.
No one can tell you to stay or leave, only you and your inner self worth know what you can handle.
But dont bottle it up.
Read everything on here that you can.
See how others suffered and survived.
This is not easy and there is no quick fix.
He made the bad choice of cheating, that will never be on you.
Stay strong and seek more insight and help.
And the person who had your heart in his hands just wipes his dirty boots with it.....
There are so many people .. some may have even commented on your post, that this exact thing has happened to them.
I know people finding out will be embarrassing. How could you have let this happen? How did you not know? Oh look at Jane, here good for nothing husband cheated on her..
I know why you are afraid.. I was too. But I did it.. we are still together 5 years later.
Read this article that convinced me.. best advice I ever got..
Why Exposure
The issue of exposure of an affair comes up when a betrayed spouse has first learned about the affair. Should it be exposed to others, or kept secret? I almost always recommend exposure. When should it be exposed? I almost always recommend that it be exposed immediately. To whom should it be exposed? I recommend that family, friends, children, clergy, and especially, the lover's spouse be informed. If the affair is at the workplace each person's supervisor and/or the personnel department should be told.
These are very difficult recommendation to follow, and they are very controversial. But I've come to these conclusions after carefully considering the results of exposing an affair as opposed to not exposing it. My direct experience with tens of thousands of couples who have done one or the other had led to recommend exposure decisively. Without a doubt, it's an essential part of a plan that's been shown to be the most likely way to end an affair and to save a marriage.
https://www.marriagebuilders.com/when-should-an-affair-be-exposed.htm